Development status and prospects of simulation materials for catastrophic prone strata in the physical model experiments on coal and rock dynamic disasters
The three-dimensional large-scale physical model test based on the similarity theory is an effective means to reveal the mechanism of coal and rock dynamic disasters,and has been widely used in the research of rockburst,coalburst,coal and gas outburst.Disaster formation simulation materials are the basis for carrying out disaster physical model test.Deep earth engineering which is significantly different from the shallow strata is faced with a complex disaster-prone environment with multi-phase and multi-field coupling characteristics,and the material properties should also have the ability of multi-phase and multi-field coupling response.In order to scientifically guide the physical model test of coal and rock dynamic disaster in deep earth engineering,the historical a-chievement of the development of typical dynamic disaster simulation materials is sorted out,the virtue and shortcoming of material preparation methods,performance evaluation and test applica-tion are analyzed.In view of the complex disaster-prone environment in deep earth engineering,the scientific and technological challenges and prospects of similar materials are proposed.The a-nalysis shows that the application scenarios of similar materials show a changing trend from single phase to multi-phase and single field to multi-field,the material preparation changes from a single solid phase to two-phase or three-phase flow material with gas adsorption and fluid seepage func-tions,and the material evaluation or analysis changes from a single statics performance to a con-sideration of multiple properties such as dynamics,thermodynamics and seepage mechanics.To meet the multi-field coupling requirements of stress field,temperature field and seepage field.However,the multi-phase and multi-field coupling similarity theory is not perfect,especially the multi-phase and multi-field similarity criterion has not been established under static and dynamic loading superposition,which leads to the lack of scientific basis to determine the multi-field per-formance parameters of physical model test materials.It is difficult for the existing similar materi-als preparation system to meet the needs of multi-phase and multi-field coupling,so it is urgent to develop new aggregates,cementing agents and admixtures to reproduce the dynamic disaster phe-nomenon of coal and rock under low strength conditions.Large-scale physical model construction needs to shift from manual to 3D intelligent printing,intelligent printing systems suitable for multi-phase materials need to be developed,3D intelligent printing algorithms for complex geolog-ical models need to be developed,and key and difficult points such as heterogeneous rock formation printing,structural plane printing,and intelligent control need to be solved.
deep earth engineeringphysical model testcatastrophic prone strataphysical simulation materialmulti-phaseand multi-field coupled
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